Both Paget and Clifton Promise were provisionally suspended from all national and international competition in October, after initial testing on Clifton Promise returned a positive result for the prohibited sedative.

Paget is likely to lose his Burghley title as well as the £60,000 first prize and faces a minimum two-year suspension. However, the 30-year-old has vowed to clear his name.

"I know I've done nothing wrong here," Paget told the Daily Telegraph. "We are working with a team of lawyers and scientists, they know the hoops I have to jump through and we're going to put together a case. I'm looking forward to the day I can prove I'm not a doper."

Clifton Promise became the first horse since 1989 to win both the Badminton and Burghley trials in the same year, but owner Frances Stead stated: "I think everyone has already worked out that there was no 'enhanced performance' by a horse being asked to then jump round the Burghley cross-country - probably the toughest in the world - while sedated with reserpine."